TM 9-4120-403-14
Section III OPERATION UNDER USUAL CONDITIONS
2-5. ASSEMBLY AND PREPARATION FOR USE
Services of Unit Maintenance should be employed for original unpacking, assembly installation, and preparation for use.
2-6. INITIAL ADJUSTMENTS AND CHECKS
a. Inspect all covers, panels, grilles, and screens for loose mounting, obstructions, or shipping damage. Report any
deficiencies to Unit Maintenance.
b. Perform the preventive maintenance checks and services listed in table 2-1.
2-7. GENERAL OPERATING PROCEDURES
a. Before operation.
(1) Check to see that power cable has been connected to a source of 115 volt, single phase, 3 wire, 50/60 hertz
power, and to the input power connector on the unit.
CAUTION
Do not perform the operational check in COOL mode until input power has been supplied to the unit for at
least four hours. Liquid refrigerant tends to migrate into the compressor crankcase and cylinders during
periods when the compressor heater is not operating. Under moderate climatic conditions, the compressor
heater will normally "boil" all liquid refrigerant out within a four hour period. If the air conditioner has been
exposed to below freezing temperatures without input power, an eight hour warmup period is
recommended.
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